中国塑料 ›› 2022, Vol. 36 ›› Issue (8): 36-41.DOI: 10.19491/j.issn.1001-9278.2022.08.006

• 材料与性能 • 上一篇    下一篇

滑石、CaCO3、BaSO4填充PP复合材料力学性能及界面相互作用对比

张陶忠1, 陈晓龙2(), 郝晓宇1, 于福家2   

  1. 1.山西紫金矿业有限公司,山西 忻州 034000
    2.东北大学资源与土木工程学院,沈阳 110819
  • 收稿日期:2022-04-11 出版日期:2022-08-26 发布日期:2022-08-22
  • 通讯作者: 陈晓龙(1977—),男,讲师,从事矿产资源加工技术及无机矿物材料研制与开发,27863195@qq.com
    E-mail:27863195@qq.com
  • 基金资助:
    国家自然科学基金(51874073)

Comparison of mechanical properties and interfacial interactions of polypropylene composites filled with talc, calcium carbonate, and barium sulfate

ZHANG Taozhong1, CHEN Xiaolong2(), HAO Xiaoyu1, YU Fujia2   

  1. 1.Shanxi Zijin Mining Group Company Limited,Xinzhou 034000,China
    2.College of Resource and Civil Engineer,Northeastern University,Shenyang 110819,China
  • Received:2022-04-11 Online:2022-08-26 Published:2022-08-22
  • Contact: CHEN Xiaolong E-mail:27863195@qq.com

摘要:

以3种白色矿物粉体[颗粒状CaCO3、BaSO4,片层状滑石(talc)]为填料,聚丙烯(PP)为基体树脂,通过熔融共混法制备PP复合材料,研究3种矿物粉体在不同含量时对PP复合材料的力学性能、流动性能与断裂形貌的影响规律,并采用Turcasanyi半经验公式计算了矿物填料与PP复合材料力学性能界面相互作用。结果表明,3种矿物粉体的加入均降低了PP的拉伸强度,PP/talc复合材料的拉伸强度明显高于PP/CaCO3 与PP/BaSO4,且talc的加入明显增强了PP的拉伸模量与弯曲模量;CaCO3 与BaSO4的加入使复合材料弯曲强度降低,talc的加入使复合材料弯曲强度提高;CaCO3对PP断裂伸长率与悬臂梁缺口冲击强度的提升最为明显;talc的加入使复合材料流动性能得到提高,而颗粒状的CaCO3与BaSO4的加入对加工性能影响较小;CaCO3 与BaSO4在PP中均存在一定团聚现象,且与PP相容性较差,存在明显界面缺陷;talc与PP间界面较模糊,二者之间有较强的黏结作用。

关键词: 聚丙烯, 白色矿物填料, 复合材料, 力学性能, 流动性能

Abstract:

Polypropylene (PP)?matrix composites were prepared through melt blending with three types of white mineral powders including granular calcium carbonate (CaCO3) and barium sulfate (BaSO4) and lamellar talc as fillers. The effects of three types of mineral powders on the mechanical properties, flow properties and fracture morphology of the resultant composites were investigated. In addition, Turcasanyi formula was used to calculate the interface interaction between the PP matrix and mineral fillers. The results indicated that the composites showed a decrease in tensile strength with the addition of mineral powders. The tensile strength of the PP/talc composite was significantly higher than those of the PP/CaCO3 and PP/BaSO4 composites. The addition of talc significantly enhanced the tensile and bending moduli of PP and also increased its bending strength. However, the addition of CaCO3 and BaSO4 reduced the bending strength of PP. CaCO3 exhibited the most obvious effect to improve the elongation at break of PP and the notch impact strength of cantilever beam. The addition of talc improved the fluidity of the composites, whereas the addition of granular CaCO3 and BaSO4 showed few effects on the process ability. CaCO3 and BaSO4 were agglomerated in PP due their poor compati?bility with PP and obvious interface defects. The interface between talc and PP was vague, and there was a strong bon?ding effect between talc and PP.

Key words: polypropylene, white mineral filler, composite, mechanical property, flow property

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